ts-02-groupby

0.000

0/1 tests· typing

Proposed solution

```typescript
export function groupBy(
  items: T,
  keyFn: (item: T) => U,
): Record<U, T[]> U>
```

```typescript
export function groupBy(
  items: T,
  keyFn: (item: T) => U,
): Record<U, T[]> U>
```

```typescript
export function groupBy(
  items: T,
  keyFn: (item: T) => U,
): Record<U, T[]> U>
```

```typescript
export function groupBy(
  items: T,
  keyFn: (item: T) => U,
): Record<U, T[]> U>
```

```typescript
export function groupBy(
  items

Test output (stdout)

TAP version 13
# node:internal/modules/run_main:107
#     triggerUncaughtException(
#     ^
# Error: Transform failed with 1 error:
# /tmp/llmlab-ts-02-groupby-fjvr9fy8/solution.ts:4:18: ERROR: Expected ";" but found "U"
#     at failureErrorWithLog (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:1748:15)
#     at /home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:1017:50
#     at responseCallbacks.<computed> (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:884:9)
#     at handleIncomingPacket (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:939:12)
#     at Socket.readFromStdout (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:862:7)
#     at Socket.emit (node:events:509:28)
#     at addChunk (node:internal/streams/readable:563:12)
#     at readableAddChunkPushByteMode (node:internal/streams/readable:514:3)
#     at Readable.push (node:internal/streams/readable:394:5)
#     at Pipe.onStreamRead (node:internal/stream_base_commons:189:23) {
#   name: 'TransformError'
# }
# Node.js v24.16.0
# Subtest: solution.test.ts
not ok 1 - solution.test.ts
  ---
  duration_ms: 62.039688
  type: 'test'
  location: '/tmp/llmlab-ts-02-groupby-fjvr9fy8/solution.test.ts:1:1'
  failureType: 'testCodeFailure'
  exitCode: 1
  signal: ~
  error: 'test failed'
  code: 'ERR_TEST_FAILURE'
  ...
1..1
# tests 1
# suites 0
# pass 0
# fail 1
# cancelled 0
# skipped 0
# todo 0
# duration_ms 65.77546

Self-repair attempts

[
  {
    "total": 1,
    "answer": "```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items",
    "passed": 0,
    "test_error": "TAP version 13\n# node:internal/modules/run_main:107\n#     triggerUncaughtException(\n#     ^\n# Error: Transform failed with 1 error:\n# /tmp/llmlab-ts-02-groupby-fjvr9fy8/solution.ts:4:18: ERROR: Expected \";\" but found \"U\"\n#     at failureErrorWithLog (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:1748:15)\n#     at /home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:1017:50\n#     at responseCallbacks.<computed> (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:884:9)\n#     at handleIncomingPacket (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:939:12)\n#     at Socket.readFromStdout (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:862:7)\n#     at Socket.emit (node:events:509:28)\n#     at addChunk (node:internal/streams/readable:563:12)\n#     at readableAddChunkPushByteMode (node:internal/streams/readable:514:3)\n#     at Readable.push (node:internal/streams/readable:394:5)\n#     at Pipe.onStreamRead (node:internal/stream_base_commons:189:23) {\n#   name: 'TransformError'\n# }\n# Node.js v24.16.0\n# Subtest: solution.test.ts\nnot ok 1 - solution.test.ts\n  ---\n  duration_ms: 62.039688\n  type: 'test'\n  location: '/tmp/llmlab-ts-02-groupby-fjvr9fy8/solution.test.ts:1:1'\n  failureType: 'testCodeFailure'\n  exitCode: 1\n  signal: ~\n  error: 'test failed'\n  code: 'ERR_TEST_FAILURE'\n  ...\n1..1\n# tests 1\n# suites 0\n# pass 0\n# fail 1\n# cancelled 0\n# skipped 0\n# todo 0\n# duration_ms 65.77546"
  },
  {
    "total": 1,
    "answer": "```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items",
    "passed": 0,
    "test_error": "TAP version 13\n# node:internal/modules/run_main:107\n#     triggerUncaughtException(\n#     ^\n# Error: Transform failed with 1 error:\n# /tmp/llmlab-ts-02-groupby-59c4jfom/solution.ts:4:18: ERROR: Expected \";\" but found \"U\"\n#     at failureErrorWithLog (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:1748:15)\n#     at /home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:1017:50\n#     at responseCallbacks.<computed> (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:884:9)\n#     at handleIncomingPacket (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:939:12)\n#     at Socket.readFromStdout (/home/psc/opt/node/lib/node_modules/tsx/node_modules/esbuild/lib/main.js:862:7)\n#     at Socket.emit (node:events:509:28)\n#     at addChunk (node:internal/streams/readable:563:12)\n#     at readableAddChunkPushByteMode (node:internal/streams/readable:514:3)\n#     at Readable.push (node:internal/streams/readable:394:5)\n#     at Pipe.onStreamRead (node:internal/stream_base_commons:189:23) {\n#   name: 'TransformError'\n# }\n# Node.js v24.16.0\n# Subtest: solution.test.ts\nnot ok 1 - solution.test.ts\n  ---\n  duration_ms: 64.564722\n  type: 'test'\n  location: '/tmp/llmlab-ts-02-groupby-59c4jfom/solution.test.ts:1:1'\n  failureType: 'testCodeFailure'\n  exitCode: 1\n  signal: ~\n  error: 'test failed'\n  code: 'ERR_TEST_FAILURE'\n  ...\n1..1\n# tests 1\n# suites 0\n# pass 0\n# fail 1\n# cancelled 0\n# skipped 0\n# todo 0\n# duration_ms 68.802638"
  },
  {
    "total": 1,
    "answer": "```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items: T,\n  keyFn: (item: T) => U,\n): Record<U, T[]> U>\n```\n\n```typescript\nexport function groupBy(\n  items",
    "passed": 0,
    "test_error": ""
  }
]

System prompt

You are an expert programmer. Solve the task exactly as specified. Output your solution as fenced code blocks using the required file name(s) and the exact function/type signatures requested. Prefer correctness; do not include prose outside code unless asked.